Rebelboy
Green Slime
I was doing arcade and failed a challenge room, which I then walked out of and accidentally back in, which prompted the challenge again, but without a timer box (timer was still there because I could still time it out). I could repeat going out and back in. When I completed the room I got the rewards for completing it, even though I failed it multiple times.
Below an example of a retry for a challenge room:
Below an example of a retry for a challenge room: